Re: Fluorescence
Re: Fluorescence
- Subject: Re: Fluorescence
- From: email@hidden
- Date: Sun, 18 Feb 2001 21:35:31 EST
In a message dated 2/16/01 10:36:27 AM, email@hidden writes:
>
I would like to clear up a misconception that some people have about
>
fluorescence. It is not only caused by ultraviolet radiation. Fluorescence
>
can
>
also be initiated by light in the visible spectrum.
Simply taking UV filtered and non-filtered readings can detect paper
whiteners and other UV based fluorescence; but a bi-spectral
spectrophotometer (which measures both output and response at each segment of
the spectrum) is required to check for visible range fluorescence. Using this
type of spectro is incredibly slow, and the devices are very expensive. So we
typically restrict ourselves, on a practical basis, to checking for
whiteners, and let the big labs determine what inks and dyes are fluorescent.
C. David Tobie
Design Cooperative
email@hidden